1992 SVX Roms

As many of you are aware, the November 1993 issue of the Service Helpline Update contains a "ROM Application Chart". In this chart, you will find that the applicable part number listing for the 1992 SVX ROM is 22677AA040 as long as the ECU part number is 22611AA680, 681, or 682.

When confronted with a customer complaint of cold/hot start rough running and stall or 2 step acceleration and, if prior installation of part number 22677AA040 is unknown, please check the vehicle's history prior to opening the ECU. If no evidence of prior installation is found and you have opened the ECU, please be aware that some ECUs have had a ROM installed at the port. (If this is the case, then the tan resistor has also been cut or removed.) At this time, you must determine which ROM is in the ECU. The ROM is identified by the white label which is affixed to the top of the ROM. Any ROM label having the markings of either "F23AYH06" or "23011" or a combination of both is part number 22677AA040 and does not need to be replaced. Any ROM having a different identification number(s) should be replaced with the 22677AA040 for the above mentioned driveability condition as described in Service Bulletin numbers 02-87-92 and 02-87-92R.

Additionally, if you have a 22611AA680 ECU, it may not have the black noise suppressor as described in Service Bulletin number 11-44-93 due to a difference in the circuit board. Therefore, no modification to the acceleration logic control is necessary.